Need some help

I’m new to this app, but I could really use some advice. My husband and I have been TTC with our 3rd since June, and nothing has happened. When we had our first it was a surprise, when we had our second we’ve only been trying for three weeks, and now I feel like There is something wrong with me because it is taking us six months to try it with our 3rd. It has really taken an emotional turn on me. I wanted it to happen so bad in November but because it didn’t I feel so lost. We are not telling our family that we are trying, so I have no one that I can talk to about this. Please help